Variable capacity hydraulic pump



May 24, 1949. c. J. CHRISTOPHER 2,471,195

VARIABLE CAPACITY HYDRAULIC PUMP Filed Deo. 5, 1947 3 Sheets-Sheet 1 ATI'CI RN EYS May 24, 1949.

c. J. CHRISTOPHER 2,471,195

VARIABLE CAPACITY HYDRAULIC PUMP Filed Deo. 5, 1947 s snee'ts-sneet 2 ATTU RN EYS May 24, 1949 c. J. cHRlsToPHl-:R 2,471,195

VARIABLE CAPACITY HYDRAULIC PUMP Filed'Deo. 5, 1947 3 Sheets-Sheet 3 Patented May 24, 1949 UNITED STATES PATENT OFFICE VARLE CAPACITY HYDRAULIC PUMP Claude J. Christopher, Los Angeles, Calif.

Application December 5, 1947, Serial No. 789,827

3 Claims. 1

This invention relates to a variable capacity hydraulic pump.

It is an object of the present invention to provide in a hydraulic pump a simple mechanism for adjusting the stroke of a plurality of circumferentially disposed pump pistons.

Other objects of the present invention are to provide a variable capacity pump which is of simple construction, easy to adjust, inexpensive to manufacture, durable, compact, has minimum parts and is efficient in operation.

For a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which Fig. 1 is a transverse sectional view taken through the pump employing the adjusting mechanism of the present invention,

Fig. 2 is a fragmentary cross-sectional View taken on line 2-2 of Fig. 1 and looking in section upon the adjusting plate,

Fig. 3 is a vertical sectional View of the pump as viewed on line 3-3 of Fig. 1,

Fig. 4 is a fragmentary and detail view taken through the projections of the adjusting plate and on line 4 4 of Fig. 1,

Fig. 5 is a detail side view, in elevation, of one of the connecting links,

Fig. 6 is a transverse cross-sectional view similar to Fig. 1 but showing the adjustable plate with the linkage connections to the driving plate and piston adjusted to different positions than shown in Fig. 1,

Fig. '7 is a fragmentary and sectional view taken on line 1 1 of Fig. 6.

Referring now to the figures, I0 represents a housing part to which is connected plates I I and I2. The plate I I has a large hub portion I3 and a bearing sleeve I4 therein for supporting a shaft I5. A packing nut I6 retains a packing ring I1 within the hub portion I3. The plate II is secured to the housing part I0 by large screws I8.

The plate I2 has a bearing sleeve I 9 in which is journalled a projection 2| of the shaft I5. The shaft is retained against displacement from the plate I2 by a cotter pin 22 extending through the shaft projections 2I and a lock nut 23. The plate I2 can be adjusted in the casing part III. A handle portion 24 extends from the plate I2. A pull pin 25 is extended through the handle portion 24 and into any one of a plurality of adjusting holes 26 in the housing part I0 so that the plate can be retained in any one of several angularly adjusted positions.

The shaft I5 has an enlarged eccentric portion (Cl. 10S-174) 21 on which is mounted a driving plate 28. This driving plate has a projection 29 extending radially therefrom for connection with a piston rod 3l of a piston 32 operable in a pump cylinder 33. Each pump cylinder is provided with fluid conduits 34 and 35 having conventional intake and exhaust valves 34 and 35', respectively. The cylinder 33 is flanged at 36 and is secured to the housing part I0 by fastening screws 31.

On the plate I2 are a plurality of anchor projections 38 extending inwardly from the inner face of the plate I2 and are adapted to respectively receive a pair of slotted arcuate shaped links 39. These links 39 serve to connect the projection 29 with the piston rod 3I. Between the links there is extended a slide 4I to which piston rod 3l is connected by a p-in 42. The slide 4I works in the slots of the arcuate shaped links and between the respective links. Since the driving plate 28 is on an eccentric, the driving plate 28 will oscillate and will through the arcuate shaped links 39 move the piston 32 upwardly. The length of stroke will depend upon the distance to which the slide 4I is located from the connection of the arcuate links 39 With the anchor portion 38.

The driving plate 29 has a different means for its connection with the piston rod of the other pistons. Projections 44 thereon are provided with a pivot link 45, Fig. 5, so as to permit a rocking movement of the arcuate shaped members 39 connected to the member 45. The pivotal connection between the member 45 and the arcuate members 39 is indicated at 46. The anchor portion 38 has a top part 48 into which a pivot pin 49 is extended. The bottom link 39 is connected to the plate I2 by a pivot pin 50, Figs. 4 and 7.

It will be apparent that as the shaft I5 is driven the pump pistons 32 will be operated. While this mechanism has been described as a pump it will be apparent that it can be utilized as a power transmission unit and the control therefor serving to alter the output speed of the transmission.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as dened by the appended claims.

I claim:

1. A hydraulic pump comprising a housing, pump cylinders radially arranged in the housing, pistons operable in the pump cylinders, a shaft extending into the housing and having an eccentric portion thereon, a driving plate connected to the eccentric portion, an adjustable plate forming a part of the housing and having anchor por- 3 tions thereon, slotted links pivotally connected to the anchor portions, a slide operable between the slotted links, a piston rod connected to the slide, and a connection between the driving plate and the slotted links to operate the same and to eiect the movement of the pistons.

2. A hydraulic pump comprising a housing, pump cylinders radially arranged in the housing, pistons operable in the pump cylinders, a shaft extending into the housing and having an eccentric portion thereon, a driving plate connected to the eccentric portion, an adjustable plate forming a part of the housing and having anchor portions thereon, slotted links pivotally connected to the anchor portions, a slide operable between the slotted links, a piston rod connected to the slide, and a connection-between the driving plate and the slotted links to work the same and to effect the operation of the pistons, and connection between the driving plate and the slotted links being a pivoted link connector and serving 'to move the slotted links radially inwardly and outwardly.

3. A hydraulic pump comprising a housing, pump cylinders radially arranged in the housing, pistons operable in the pump cylinders, a shaft extending into the housing and having an eccentric portion thereon, a driving plate connected to the eccentric portion, an adjustable plate forming a part of the housing and having anchor portions thereon, slotted links pivotally connected to the anchor portions, a slide operable between the slotted links, a piston rod connected to the slide, and a connection between the driving plate and the slotted links to operate the same and to effect the movement of the pistons, and said adjustable plate having a handle portion thereon, said housing having a plurality of adjusting holes and a pull pin insertable through the handle and into any one of the adjusting holes of the housing.

CLAUDE J. CHRISTOPHER.

No references cited. 

